I have question on my own understanding.. So please correct me.. 1. It is said that mass of photon is zero; Or it is so small that it can be neglected without any problems. 2. An object cannot surpass speed of light, because as it approaches to light speed, it's mass increases, and it require much more energy to accelerate it more. At light speed, the mass of object in Infinite! My question is, Why the mass of photon is not infinite at light speed?